Check the bottom of the Ice Tray where the ice dumps in. It may have a slight water leak and be freezing ice on the bottom of the auger. Or maybe the door itsself is freezing shut from room air getting into the down spout causeing it to freeze up then pops off when you want ice.You description sounds mechanical not electrical so I wouldn't think a switch would help you.

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a few things to look at on a ice dispenser
1st remove ice bucket with auger completely out of fridge
look at back of fridge is there a build up of ice there ? if so you may have a leaking water valve for ice maker
carefully inspect the back of ice bucket to see that drive catch is not broken or missing parts
2nd verify that the door to side that contains the dispenser is all the way shut , sometimes ice build up keeps door from closing all the way to allow door switch to say ( door closed safe to dispense ice) this switch is not allways at top or bottom of door but maybe in the middle too
and last but not least , make sure all switches and childlock outs are set correct to working positions and that glass sensors detect the glass in its place

Hello, click this link for the schematic of your LG dispenser area http://c.searspartsdirect.com/lis_png/PLDM/F1107040-00005.png there are two switches which would need to be tested using a multimeter for continuity which are 402e and 402 c this would assure that both switches are working properly. If both switches were working properly you would then assure that you had no freeze up of ice on part 278d. If you find that both switches are working properly and the funnel which is 278d was not iced over you would then need to diagnose if the switches were getting power from the small control noted on diagram as 501D. If you have any further questions message me back. Note only one of the switches controls the ice auger motor to activate the ice to come down the shute the other one controls the water. I await any further questions that you may have Thanks
Rick

do you here anything at all happening when you hit the switch... if you not then most likely got a bad door switch or handle is broke at the area where it makes contact with the door micro switch...if you are hearing noise when activating the door switch you are good at the door... with the door opened hold down the actually freezer door switch and look in your ice maker while someone activates the ice dispenser switch. makes sure the augur motor is turning and if it is then make sure it is turning the ice bucket auger screw fairly simple process to go through...
the operation is as follows
the dispenser handle makes contact with a microswitch in the door and sends power to the auger motor telling it to turn.. once the auger motor starts to turn then it makes contact with the screw in the bucket and turns the screw in bucket forcing ice to front of dispenser and the dispenser has a flap that works both off of power sometimes or just by force of hand others... make sure it is opening and chute down and out door is opened. hope this helps good luck

If the auger will move freely with ice out of the pan then the auger motor may be defective. Sometimes the connection in the door switch is defective. When the door is closed the switch turns the circuit on to the auger and control panel. Because the auger uses more amps that the water dispenser the door switch may be the problem or auger motor is just worn out.

When it doesn't dispense , do you hear the auger turning ? If so , then the dispensor flap is not opening completely . This is caused by a rusted plunger in the solenoid which opens the flap . If you use crushed ice often , then could be a build up in the ice shoot which has to be cleaned regularly .

When you push the ice dispensing lever, you should be able to hear the micro-switch clicking. If no click, the switch is faulty. The auger motor which is activated by the lever could also be faulty. This is the motor that causes the auger in the ice bucket to rotate one way for crushed ice and the other way for cubes. The auger could also be jammed. Try switching between crushed and cubes to unjam the auger. Empty the ice bucket and start again.

take out ice bin, make sure you get it lined up when put back together, should click,sometimes they are a little off and you have to keep trying, mine has that defect, it works, but only on its terms, its a pain to do, but that can stop it from working due to a safety thing